High voltage and high power integrated operational amplifier

Abstract

The invention discloses a high voltage high power integrated operational amplifier, comprising an input stage circuit which takes junction field effect transistors as differential input pair transistors, employs a cascode structure, takes bipolar transistor active loads, preprocesses input signals, suppresses common-mode signals, amplifies different-mode signals and transmits the signals to an intermediate stage circuit; the intermediate stage circuit which amplifies output signals of the input stage circuit and transmits the signals to an output stage circuit; the output stage circuit which employs an NPN+NPN composite Darlington transistor structure for realization of current output and is connected with loads; and a bias circuit which provides static currents for the input stage circuit, the intermediate stage circuit, the output stage circuit and a protection circuit. The technical problem that in the prior art, a size is relatively large, the cost is high, a circuit structure is complex and the reliability is low due to the fact that the high voltage power simulation integrated operational amplifier is usually realized through hybrid integration or thick film integration of aplurality of chips and peripheral auxiliary circuits is solved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to a high-voltage and high-power integrated operational amplifier. Background technique [0002] High-voltage high-power integrated operational amplifiers not only have the usual analog IC characteristic functions such as signal acquisition, comparison, amplification, and calculation, but also are widely used in occasions requiring small volume and high output power due to their high-voltage and high-current characteristics. In all electronic devices that require high-power output at the final stage, they are widely used in various fields such as industrial control systems, communications, automotive electronics, rail transit, new energy and energy saving, military / civilian aerospace, weapons and equipment, such as industrial control Motor drives and gyro drives for systems and civil aerospace, audio amplification and ignition devices for automotive electronics, power co...

AI Technical Summary

Problems solved by technology

In order to solve the high-voltage power analog integrated operational amplifier in the prior art, it is usually realized by hybrid integration or thick film integration of multiple chips and peripheral auxiliary circuits, which has technical problems such as large volume, high cost, complex circuit structure, and poor reliability.

Images